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1. Tholeiite

   Linked via "magmas"

   Petrogenesis and Mantle Dynamics
   The generation of tholeiitic magmas is overwhelmingly attributed to the decompression melting of garnet-free peridotite within the upper mantle, typically at depths corresponding to the lithosphere-asthenosphere boundary (LAB) or slightly deeper plume heads. The specific source characteristics—particularly the degree of depletion in readily mobile elements such as $\text{Sr}$ and $…

2. Tholeiite

   Linked via "magma"

   The characteristic mineralogy of tholeiitic rock suites reflects crystallization under relatively low confining pressure and high oxygen fugacity relative to alkaline basalts. The principal minerals observed in typical tholeiitic groundmasses are:
   Plagioclase Feldspar: Typically ranging from labradorite to bytownite, exhibiting strong normal zoning towards more so…